The P0174 code means:
P0174 System Too Lean - Bank No. 2.
Bank 2 is the front cylinder bank. The lean code is tripped by a low reading from the top or 'upstream' sensor. This is pretty easy to reach and replace. Chances are that a new sensor will correct this problem. The Bosch direct replacements are about $70 at AZ. I think they have a loaner O2 sensor socket if you dont want to buy one.
Your car has a total of 4 O2 sensors, upstream and downstream for banks 1 & 2.
